CN216054807U - Flow field runner structure of fuel cell, bipolar plate and fuel cell - Google Patents

Flow field runner structure of fuel cell, bipolar plate and fuel cell Download PDF

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Publication number
CN216054807U
CN216054807U CN202121306950.9U CN202121306950U CN216054807U CN 216054807 U CN216054807 U CN 216054807U CN 202121306950 U CN202121306950 U CN 202121306950U CN 216054807 U CN216054807 U CN 216054807U
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flow field
flow
flow channel
fuel cell
channel
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李骏
周飞鲲
刘玉新
梁鹏
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Foshan Xianhu Laboratory
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Foshan Xianhu Laboratory
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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Abstract

The utility model discloses a flow field runner structure of a fuel cell, a bipolar plate and the fuel cell, wherein the flow field runner structure comprises: the flow field device comprises a first flow channel wall and a second flow channel wall, wherein the first flow channel wall and the second flow channel wall form a flow field flow channel; the first flow channel wall and the second flow channel wall are symmetrically arranged along the central line of the flow field flow channel, and the first flow channel wall is in a wavy shape; and establishing a rectangular coordinate system by taking the starting point of the flow channel of the flow field as an origin, wherein the extending direction of the flow channel towards the flow field is the horizontal coordinate direction, the direction of the flow channel wall towards the first flow channel is the vertical coordinate direction, the length of the flow channel of the flow field is x, the fluctuation amplitude of the first flow channel wall relative to the central line of the flow channel of the flow field is y, x and y meet the sine change relationship, namely y = Asin (x) + C, and A and C are constants. The bipolar plate includes the flow field channel structure described above. While the fuel cell has the bipolar plate described above. The utility model is mainly used in the technical field of fuel cells.

Description

Flow field runner structure of fuel cell, bipolar plate and fuel cell
Technical Field
The utility model relates to the technical field of hydrogen fuel cells, in particular to a flow field runner structure of a fuel cell, a bipolar plate and the fuel cell.
Background
The hydrogen fuel cell has the characteristics of high thermal efficiency and no pollution discharge, and is widely applied to various power fields. The design of a fuel cell bipolar plate is directly related to the performance of the fuel cell. The design of the current fuel cell bipolar plate mainly considers the improvement of the gas supply capacity, the monomer consistency and the drainage of the fuel cell. At present, two main ways of improving the drainage of the fuel cell bipolar plate are provided, one is to carry out the treatment of a hydrophobic coating on the surface of the fuel cell bipolar plate; and designing a flow channel with hydrophobic characteristics.
However, in the conventional bipolar plate, the water is discharged from the flow channels at a low speed, and the water is easily accumulated in the flow channels.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to provide a flow field channel structure of a fuel cell, a bipolar plate and a fuel cell, so as to solve one or more technical problems in the prior art, and to provide at least one useful choice or creation.
The solution of the utility model for solving the technical problem is as follows: there is provided a flow field channel structure of a fuel cell, including: the flow field device comprises a first flow channel wall and a second flow channel wall, wherein the first flow channel wall and the second flow channel wall form a flow field flow channel;
the first flow channel wall and the second flow channel wall are symmetrically arranged along the central line of the flow field flow channel, and the first flow channel wall is in a wavy shape;
and establishing a rectangular coordinate system by taking the starting point of the flow channel of the flow field as an origin, wherein the extending direction of the flow channel towards the flow field is the horizontal coordinate direction, the direction of the flow channel wall towards the first flow channel is the vertical coordinate direction, the length of the flow channel of the flow field is x, the fluctuation amplitude of the first flow channel wall relative to the central line of the flow channel of the flow field is y, x and y meet the sine change relationship, namely y = Asin (x) + C, and A and C are constants.
Further, the size of the narrowest part of the flow field flow channel is 0.1 mm-1.1 mm.
Further, the size of the narrowest part of the flow field flow channel is 0.6 mm.
On the other hand, the bipolar plate of the fuel cell comprises a fuel gas inlet, a fuel gas outlet and a fuel gas flow field, wherein the fuel gas inlet is connected with the fuel gas outlet through the fuel gas flow field; the fuel gas flow field is provided with the flow field flow channel structure in any one of the technical schemes; wherein, the above technical scheme includes: a flow field channel structure of a fuel cell, comprising: the flow field device comprises a first flow channel wall and a second flow channel wall, wherein the first flow channel wall and the second flow channel wall form a flow field flow channel; the first flow channel wall and the second flow channel wall are symmetrically arranged along the central line of the flow field flow channel, and the first flow channel wall is in a wavy shape; and establishing a rectangular coordinate system by taking the starting point of the flow channel of the flow field as an origin, wherein the extending direction of the flow channel towards the flow field is the horizontal coordinate direction, the direction of the flow channel wall towards the first flow channel is the vertical coordinate direction, the length of the flow channel of the flow field is x, the fluctuation amplitude of the first flow channel wall relative to the central line of the flow channel of the flow field is y, x and y meet the sine change relationship, namely y = Asin (x) + C, and A and C are constants. Further, the size of the narrowest part of the flow field flow channel is 0.1 mm-1.1 mm. Further, the size of the narrowest part of the flow field flow channel is 0.6 mm.
Furthermore, the bipolar plate also comprises an oxidant inlet, an oxidant outlet and an oxidant flow field; the oxidant inlet is connected with the oxidant outlet through the oxidant flow field; the oxidant flow field is provided with the flow field runner structure in the technical scheme.
Furthermore, the bipolar plate also comprises a coolant inlet, a coolant outlet and a coolant flow field, wherein the coolant inlet is connected with the coolant outlet through the coolant flow field; the coolant flow field is provided with the flow field flow channel structure in the technical scheme.
Further, the material of the bipolar plate comprises: metal, graphite or composite.
In another aspect, a fuel cell is provided, which includes the bipolar plate of the above technical solution.
The utility model has the beneficial effects that: on one hand, the utility model can play a role in improving the flowing uniformity of fuel gas or air and improving the drainage efficiency and preventing the galvanic pile from flooding through the flow field runner structure, thereby improving the performance of the galvanic pile and the stability at high power. In another aspect, a bipolar plate having a flow field channel structure and a fuel cell having the bipolar plate are provided. The bipolar plate and the fuel cell each have the beneficial effects of a flow field channel structure and will not be described repeatedly herein.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the utility model, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
Fig. 1 is a schematic structural view of a flow field channel structure of a fuel cell;
FIG. 2 is a schematic structural view of a bipolar plate of a fuel cell;
figure 3 is a graph comparing the performance of fuel cells made using bipolar plates of the present invention.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions. All technical characteristics in the utility model can be interactively combined on the premise of not conflicting with each other.
Example 1, with reference to fig. 1 and 2, this embodiment is described in terms of a bipolar plate of a fuel cell in order to better describe the flow field channel structure of the fuel cell. Wherein, a bipolar plate of a fuel cell comprises: the fuel gas inlet 301 is connected with the fuel gas outlet 302 through the fuel gas flow field; the fuel gas flow field has a flow field channel structure of a fuel cell. Wherein the flow field channel structure comprises: a first channel wall 101 and a second channel wall 102, the first channel wall 101 and the second channel wall 102 forming a flow field channel 200; the first channel wall 101 and the second channel wall 102 are symmetrically arranged on the center line of the flow field channel 200; the first flow channel wall 101 is undulated; a rectangular coordinate system is established by taking the starting point of the flow channel of the flow field channel 200 as the origin, wherein the extending direction of the flow channel to the flow channel 200 is the horizontal coordinate direction, the direction to the first flow channel wall 101 is the vertical coordinate direction, the length of the flow field channel 200 is x, the fluctuation amplitude of the first flow channel wall 101 relative to the central line of the flow channel 200 is y, x and y satisfy the sine variation relationship, that is, y = asin (x) + C, and a and C are constants.
As for the structure of the flow field channel 200, the structure of the first channel wall 101 and the second channel wall 102 is changed, so that the flow field channel 200 formed by the first channel wall 101 and the second channel wall 102 has good drainage. The first and second channel walls 101 and 102 are symmetrically disposed through a center line of the flow field channel 200. The first channel wall 101 and the second channel wall 102 have the same structure and are both undulated. The first and second flow channel walls 101 and 102 are most characterized by regular undulations. The structure of the first and second flow channel walls 101 and 102 will be described for better explanation. The first flow channel wall 101 will be described as an example.
A rectangular coordinate system is established by taking the starting point of the flow channel of the flow field channel 200 as the origin, wherein the extending direction of the flow channel to the flow channel 200 is the horizontal coordinate direction, the direction to the first flow channel wall 101 is the vertical coordinate direction, the length of the flow field channel 200 is x, the fluctuation amplitude of the first flow channel wall 101 relative to the central line of the flow channel 200 is y, x and y satisfy the sine variation relationship, that is, y = asin (x) + C, and a and C are constants.
In some preferred embodiments, the undulation relationship of the first flow channel wall 101 satisfies the rule that y =0.25sin (x) +0.85, where the unit is mm. That is, the high point of the first channel wall 101 with respect to the center line of the flow field channel 200 has a fluctuating width of 0.55mm, and the low point of the first channel wall 101 with respect to the center line of the flow field channel 200 has a fluctuating width of 0.3 mm. Since the first and second channel walls 101 and 102 are symmetrical about the center line of the flow field channel 200. In view of this, in these embodiments, the narrowest dimension of the flow field channels 200 is 0.6mm, and the widest dimension of the flow field channels 200 is 1.1 mm. For these embodiments, the length of the flow field channels 200 is preferably 100 mm.
Through research testing, in some embodiments, the narrowest dimension of the flow field channels 200 is 0.1mm to 1.1 mm; the length of the flow field channel 200 is 99mm to 101 mm.
With the flow field channel 200 according to any of the above embodiments, the first channel wall 101 and the second channel wall 102 form a flow field similar to a gourd-shaped flow field. The cathode side and the anode side can play a role in improving the uniformity of fuel gas or air flow and improving the drainage efficiency to prevent the galvanic pile from flooding, thereby improving the performance of the galvanic pile and the stability at high power.
For the bipolar plate of this embodiment, the fuel gas flow field is formed by a plurality of linear flow field channels 200, as shown in fig. 2, in the form of flow field lands 201 on the first and second flow channel walls 101 and 102. Linear flow field channels 200 connect the fuel gas inlet 301 and the fuel gas outlet 302.
In some embodiments, the present bipolar plate further comprises an oxidant inlet 501, an oxidant outlet 502, and an oxidant flow field; the oxidant inlet 501 is connected with the oxidant outlet 502 through an oxidant flow field; the oxidant flow field has a flow field channel structure as in any of the embodiments above. For the bipolar plate in this embodiment, the oxidant flow field is formed by a plurality of linear flow field channels 200, and the linear flow field channels 200 connect the oxidant inlet 501 and the oxidant outlet 502.
In some embodiments, the present bipolar plate further comprises a coolant inlet 401, a coolant outlet 402, and a coolant flow field, the coolant inlet 401 being connected to the coolant outlet 402 by the coolant flow field; the coolant flow field has a flow field flow channel structure in any of the embodiments. For the bipolar plate of this embodiment, the coolant flow field is formed by a plurality of linear flow field channels 200, and the linear flow field channels 200 connect the coolant inlet 401 and the coolant outlet 402.
In some preferred embodiments, the material of the bipolar plate includes: metal, graphite or composite.
The utility model also provides a fuel cell comprising a bipolar plate as described in any one of the embodiments.
As shown in fig. 3, when the bipolar plates according to the examples of the present invention were assembled into a fuel cell, the voltage of the fuel cell was increased at different currents as compared to the comparative example. The operating pressure of the fuel cell is 100 kPa-110 kPa (gauge pressure), the operating temperature is 65 ℃, the air side is humidified by 50-60% (RH), and the hydrogen side is not humidified; a stack using 5-fuel cells was assembled. The comparative fuel cell is only the same stack without the flow field runner structure, and other structures and operating conditions are the same. The performance of the two stacks was compared. At higher powers, e.g. 1000mA/cm2In this embodiment, the comparison ratio is greatly improved.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the utility model and its scope is defined by the claims appended hereto.

Claims (8)

1. A flow field channel structure of a fuel cell, comprising: the flow field device comprises a first flow channel wall and a second flow channel wall, wherein the first flow channel wall and the second flow channel wall form a flow field flow channel;
the first flow channel wall and the second flow channel wall are symmetrically arranged along the central line of the flow field flow channel, and the first flow channel wall is in a wavy shape;
and establishing a rectangular coordinate system by taking the starting point of the flow channel of the flow field as an origin, wherein the extending direction of the flow channel towards the flow field is the horizontal coordinate direction, the direction of the flow channel wall towards the first flow channel is the vertical coordinate direction, the length of the flow channel of the flow field is x, the fluctuation amplitude of the first flow channel wall relative to the central line of the flow channel of the flow field is y, x and y meet the sine change relationship, namely y = Asin (x) + C, and A and C are constants.
2. The flow field channel structure of a fuel cell according to claim 1, wherein the narrowest dimension of the flow field channel is 0.1mm to 1.1 mm.
3. A flow field channel structure for a fuel cell as claimed in claim 2, wherein the narrowest dimension of the flow field channel is 0.6 mm.
4. A bipolar plate of a fuel cell is characterized by comprising a fuel gas inlet, a fuel gas outlet and a fuel gas flow field, wherein the fuel gas inlet is connected with the fuel gas outlet through the fuel gas flow field; the fuel gas flow field having a flow field channel structure as claimed in any one of claims 1 to 3.
5. The bipolar plate of a fuel cell according to claim 4, further comprising an oxidant inlet, an oxidant outlet and an oxidant flow field; the oxidant inlet is connected with the oxidant outlet through the oxidant flow field; the oxidant flow field having the flow field channel structure of any one of claims 1 to 3.
6. The bipolar plate of a fuel cell according to claim 4, further comprising a coolant inlet, a coolant outlet, and a coolant flow field, the coolant inlet being connected to the coolant outlet through the coolant flow field; the coolant flow field has a flow field flow channel structure as claimed in any one of claims 1 to 3.
7. The bipolar plate for a fuel cell according to claim 4, wherein the material of the bipolar plate comprises: metal, graphite or composite.
8. A fuel cell comprising the bipolar plate of claim 4.
CN202121306950.9U 2021-06-11 2021-06-11 Flow field runner structure of fuel cell, bipolar plate and fuel cell Active CN216054807U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121306950.9U CN216054807U (en) 2021-06-11 2021-06-11 Flow field runner structure of fuel cell, bipolar plate and fuel cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121306950.9U CN216054807U (en) 2021-06-11 2021-06-11 Flow field runner structure of fuel cell, bipolar plate and fuel cell

Publications (1)

Publication Number Publication Date
CN216054807U true CN216054807U (en) 2022-03-15

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